EP3168990B1 - Unterdrückung des übersprechens eines sendesignals in den empfängerpfad einer vorrichtung für die datenübertragung in einem powerline system - Google Patents

Unterdrückung des übersprechens eines sendesignals in den empfängerpfad einer vorrichtung für die datenübertragung in einem powerline system Download PDF

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Publication number
EP3168990B1
EP3168990B1 EP16194575.3A EP16194575A EP3168990B1 EP 3168990 B1 EP3168990 B1 EP 3168990B1 EP 16194575 A EP16194575 A EP 16194575A EP 3168990 B1 EP3168990 B1 EP 3168990B1
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European Patent Office
Prior art keywords
signal
power
value
adjusting
compensation impedance
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EP16194575.3A
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English (en)
French (fr)
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EP3168990A2 (de
EP3168990A3 (de
Inventor
Laurent Guilhem
François Fontenelle
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General Electric Technology GmbH
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General Electric Technology GmbH
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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
    • H03H7/38—Impedance-matching networks
    • H03H7/40—Automatic matching of load impedance to source impedance
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
    • H03H7/01—Frequency selective two-port networks
    • H03H7/06—Frequency selective two-port networks including resistors
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H04B3/54—Systems for transmission via power distribution lines
    • H04B3/542—Systems for transmission via power distribution lines the information being in digital form
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B2203/00—Indexing scheme relating to line transmission systems
    • H04B2203/54—Aspects of powerline communications not already covered by H04B3/54 and its subgroups
    • H04B2203/5404—Methods of transmitting or receiving signals via power distribution lines
    • H04B2203/5425—Methods of transmitting or receiving signals via power distribution lines improving S/N by matching impedance, noise reduction, gain control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B2203/00—Indexing scheme relating to line transmission systems
    • H04B2203/54—Aspects of powerline communications not already covered by H04B3/54 and its subgroups
    • H04B2203/5462—Systems for power line communications
    • H04B2203/5495—Systems for power line communications having measurements and testing channel

Definitions

  • the present invention relates generally to the field of power line carriers (CPL) which make it possible to constitute a data transmission network on an electrical network.
  • CPL power line carriers
  • It relates more precisely to the adjustment of the reinjection of a transmission signal on the power line side into a reception chain of data transmission equipment by power line power lines.
  • Certain modulations such as OFDM (Orthogonal Frequency Division Multiplexing) use two distinct frequency bands, respectively for one direction of data transmission and for the other direction.
  • OFDM Orthogonal Frequency Division Multiplexing
  • modulations such as QAM (Quadrature Amplitude Modulation)
  • QAM Quadrature Amplitude Modulation
  • One of the main characteristics of power line transmission systems is that the impedance of the medium is not controlled (see WO2014 / 056575 ).
  • the line used is a high voltage line of an electricity transmission network.
  • the impedance presented by the line and the coupling members can be very different from the nominal impedance of the access of the equipment.
  • the impedance of the line varies over time, in particular depending on weather conditions.
  • This mismatch of the line impedance in relation to the equipment access impedance can cause a significant reinjection of the signal from the local transmitter to the receiver.
  • This parasitic reinjection disturbs the good reception of the signal to be received.
  • this feedback can completely mask the received signal and prevent synchronization of the link.
  • a complex impedance compensation resistive and capacitive in general
  • the adjustment of the compensation is performed manually and once and for all when the equipment is put into service. Under these conditions, the variations in the impedance of the line over time are not taken into account, and the feedback of the transmitted signal may disturb the reception of the data, in particular if the environmental conditions of the line. energy change.
  • the invention aims to solve the problems of the prior art by providing an adjustment device according to claim 1.
  • the reinjection of the signal transmitted on the reception channel of a PLC data transmission device is limited.
  • the periodic adjustment of the feedback of the signal transmitted on the reception channel makes it possible to adapt to the variations in line impedance which may occur over time.
  • the adjustment device is thus initialized.
  • the reference signal is a transmission carrier signal used in a modulation of the transmission signal.
  • the reference signal is thus obtained very easily.
  • the reference signal is a predetermined sinusoidal signal. This feature is useful when the modulation does not include a transmit carrier signal.
  • the adjustment device is an adjustment device according to claim 5.
  • the invention also relates to equipment for transmitting data by power line power lines, characterized in that it comprises an adjustment device as previously presented.
  • the invention also relates to an adjustment method according to claim 7.
  • the steps of the method according to the invention are implemented by computer program instructions.
  • the invention is also aimed at a computer program on an information medium, this program being capable of being implemented in a computer, this program comprising instructions adapted to the implementation of the steps of a process as described above.
  • This program can use any programming language, and be in the form of source code, object code, or intermediate code between source code and object code, such as in a partially compiled form, or in any other. desirable shape.
  • the invention also relates to an information medium readable by a computer, and comprising computer program instructions adapted to the implementation of the steps of a method as described above.
  • the information medium can be any entity or device capable of storing the program.
  • the medium may comprise a storage means, such as a ROM, for example a CD ROM or a microelectronic circuit ROM, or else a magnetic recording means, for example a floppy disk or a hard disk.
  • the information medium can be a transmissible medium such as an electrical or optical signal, which can be conveyed via an electrical or optical cable, by radio or by other means.
  • the program according to the invention can in particular be downloaded from an Internet type network.
  • the information medium can be an integrated circuit in which the program is incorporated, the circuit being adapted to execute or to be used in the execution of the method according to the invention.
  • an equipment 1 for data transmission by line power lines is intended to be connected to a high voltage line L.
  • the equipment 1 comprises for the data transmission part a digital / analog converter 10 to receive data to be transmitted.
  • the converter 10 forms an analog signal from the data it receives.
  • the output of the digital / analog converter 10 is connected to the input of a power amplifier 11.
  • the converter 10 transmits the analog signal that it has formed to the power amplifier 11, the purpose of which is to amplify the signal. that he receives.
  • the output of the power amplifier 11 is connected to the input of a transmission filter 12 which performs band-pass filtering of the signal it receives.
  • the filtered signal is thus in the transmission frequency band of the equipment.
  • the output of the emission filter 12 is connected to the input of a two-wire / four-wire converter 20 whose function is to connect the chain data transmission and the data reception chain on line L.
  • the two-wire / four-wire converter 20 comprises an asymmetric differential transformer 13, or hybrid transformer, and a variable compensation impedance module 18 which will be detailed below.
  • the equipment 1 comprises from the high voltage line L the two-wire / four-wire converter 20.
  • the output of the two-wire / four-wire converter 20 is connected to the input of a reception filter 14 which performs band-pass filtering of the reception signal.
  • the filtered signal is thus in the reception frequency band of the equipment.
  • the output of the reception filter 14 is connected to the input of an attenuator 15 which corrects the amplitude of the signal applied to it.
  • the output of attenuator 15 is connected to the input of an analog / digital converter 16 to receive the reception signal after filtering and attenuation.
  • the converter 16 extracts data from the analog signal which it receives.
  • a reactive impedance matching module 17 is connected at the level of the access to the high voltage line L.
  • the reactive impedance matching module 17 comprises a capacitor and a switch.
  • the capacitor has a capacity of fixed value.
  • the capacitor can be connected in parallel on the line access in the case where the line L has a reactive impedance of the inductive type, so that the impedance view becomes capacitive again. This adjustment is carried out during the commissioning of the equipment, more precisely during the adjustment of the complex impedance compensation carried out in the hybrid transformer.
  • the two-wire / four-wire converter 20 is imperfect, since part of the transmitted signal is fed back into the reception chain.
  • the reinjected transmitted signal part can have a sufficiently large power level for signals from remote equipment.
  • the reinjected signal thus constitutes a disturbance in the reception chain, in particular if the transmission and reception frequency bands are the same.
  • the figure 2 represents a schematic example of frequency distribution of signals in a case where the transmission and reception frequency bands are the same.
  • a transmission carrier frequency Ctx and a reception carrier frequency Crx are separated by a frequency band in which the useful modulated signal transmitted and received is located.
  • reception filter 14 covers all of the two frequency bands, or in one piece if the bands are adjacent or neighboring, or by combining two filters if they are far apart.
  • the data transmission equipment 1 comprises the variable compensation impedance module 18 connected between the differential transformer 13 and the ground.
  • the variable compensation impedance module 18 comprises a resistive part and a reactive part.
  • a control module 19 controls on the one hand the transmission and reception of data proper.
  • the control module 19 is therefore connected to the digital / analog converter 10 and to the analog / digital converter 16.
  • the control module 19 is also connected to the reactive impedance adaptation module 17 and to the variable compensation impedance module 18. The control module 19 thus controls the operation of the variable compensation impedance module 18.
  • the variable compensation impedance module 18 comprises a resistive part and a reactive part. More precisely, the resistive part of the module 18 comprises for example resistors R1, R2 and R3 switched by electromechanical or static relays RL1, RL2 and RL3 and a digital potentiometer PN. The relays are used for coarse adjustment of the resistive part and then the potentiometer is used for fine adjustment.
  • the resistive part can include a resistive opto-isolator instead of resistors, relays and potentiometer.
  • the reactive part comprises capacitors C1 to C4, also switched by electromechanical or static relays RL4 to RL7.
  • the control module 19 controls the relays RL1 to RL7 and the PN potentiometer so as to define the compensation impedance.
  • the figure 4 represents the operation of the variable impedance compensation module 18 controlled by the control module 19, in the form of a flowchart comprising steps E1 to E2.
  • Step E1 is an initialization which is carried out after switching on the equipment 1 and an adjustment of the gains carried out by an automatic gain control system, conventional in itself and not described in the present application.
  • the initialization comprises the transmission of a predetermined reference signal and the search for the minimum power of the signal reinjected into the reception chain.
  • the reference signal is preferably the transmission carrier signal, which is shown at figure 2 .
  • This signal consists of a simple sinusoid.
  • the power of the reinjected part of the reference signal (transmission carrier or reference frequency) is measured using a narrow digital filter centered on this frequency and a power measurement followed by integration to give a stable image of this power. Note that the measurement does not need to be fast.
  • the next phase consists in finding the minimum of the value of this power as a function of the compensation impedance, defined by the setting of module 18.
  • a conventional algorithm for finding extremum can be used, for example by successive dichotomy. .
  • Step E1 results in an initial value of the compensation impedance Zci which minimizes the power of the reference signal fed back to a value Pi.
  • the initial value of compensation impedance Zci is then used as a reference value and remains fixed during an initialization and synchronization phase of the communication. This phase is conventional and known to those skilled in the art. It will therefore not be described here.
  • step E2 for regulating the reinjection of the transmission signal into the reception chain.
  • Step E2 comprises sub-steps E21 to E23.
  • Step E21 is a measurement of the power of the transmission carrier signal reinjected into the reception chain.
  • a sinusoidal transmission signal is added.
  • this added sinusoidal signal is a stable signal in frequency and power located on the edge of the useful spectrum and transmitted with a low power level, on the one hand, not to disturb the useful signal and, on the other hand, not to waste the power of the transmitter unnecessarily . This signal may not be emitted until the measurement is taken.
  • the power measurement is performed as during the initialization step E1, using a narrow digital filter centered on the frequency of the carrier or of the added signal and a power measurement followed by integration to give a stable image of this power.
  • the next step E22 is a test to determine whether the measured power is within a predetermined interval around the value Pi of the reinjected power which was determined in step E1.
  • step E22 is followed by step E21 described above.
  • step E22 is followed by step E23 which is a search for the minimum power of the signal reinjected into the reception chain.
  • step E1 the minimum of the value of this power is sought as a function of the compensation impedance, defined by the setting of module 18.
  • a conventional algorithm for finding extremum can be used, by example by successive dichotomy.
  • the only adjustment parameter here is the compensation impedance value Zc. Indeed, the inductive or capacitive character of the line L is permanent and it is not necessary to vary the setting of the reactive impedance adaptation module 17.
  • Step E23 is followed by step E21 described above.
  • Step E2 is implemented regularly while the communication is established, for example every minute.
  • the adjustment of the transmission signal feedback into the reception chain is thus optimized at all times.

Claims (10)

  1. Vorrichtung zum Regeln der Rückkopplung eines Sendesignals in eine Empfangskette einer Powerline-Datenübertragungsausrüstung, wobei die Datenübertragungsausrüstung einen Zweidraht-/Vierdraht-Wandler (20) umfasst, um eine Datensendekette und die Datenempfangskette mit einer Leitung (L) zu verschalten, wobei der Wandler einen asymmetrischen Differentialtransformator (13) umfasst, dadurch gekennzeichnet, dass er umfasst:
    - ein Mittel (18, 19) zum Messen der Leistung eines Signals, das in die Empfangskette rückgekoppelt wird, wenn das Sendesignal gesendet wird,
    - ein Mittel (18, 19) zum Vergleichen der gemessenen Leistung mit einem vorbestimmten Leistungswert,
    - ein Modul mit variabler Kompensationsimpedanz, das eine Kompensationsimpedanz umfasst und zwischen den asymmetrischen Differentialtransformator und die Masse geschaltet ist,
    - ein Mittel (18, 19) zum Regeln des Werts der Kompensationsimpedanz (Zc), wenn die gemessene Leistung außerhalb eines vorbestimmten Intervalls um den vorbestimmten Leistungswert liegt.
  2. Regelvorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass sie dazu geeignet ist, den vorbestimmten Leistungswert zu regeln, und dadurch, dass sie umfasst:
    - ein Mittel zum Senden eines Referenzsignals,
    - ein Mittel zum Messen der Leistung eines Signals, das in die Empfangskette rückgekoppelt wird, wenn das Referenzsignal gesendet wird, und
    - ein Mittel zum Regeln des Werts der Kompensationsimpedanz, das dazu geeignet ist, die Leistung des rückgekoppelten Signals zu minimieren, wobei der vorbestimmte Leistungswert auf den Minimalwert der Leistung des rückgekoppelten Signals geregelt wird.
  3. Regelvorrichtung nach Anspruch 2, dadurch gekennzeichnet, dass es sich beim Referenzsignal um ein Sendeträgersignal handelt, das bei einer Modulation des Sendesignals verwendet wird.
  4. Regelvorrichtung nach Anspruch 2, dadurch gekennzeichnet, dass es sich beim Referenzsignal um ein vorbestimmtes Sinussignal handelt.
  5. Regelvorrichtung nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass das Modul mit variabler Kompensationsimpedanz einen ohmschen Anteil und einen reaktiven Anteil umfasst, und dadurch, dass das Mittel (18) zum Regeln des Werts der Kompensationsimpedanz ein Steuermodul umfasst, um die Regelungswerte des ohmschen Anteils und des reaktiven Anteils zu regeln.
  6. Powerline-Datenübertragungsausrüstung (1), dadurch gekennzeichnet, dass sie eine Regelvorrichtung nach einem der Ansprüche 1 bis 5 umfasst.
  7. Verfahren zum Regeln der Rückkopplung eines Sendesignals in eine Empfangskette einer Powerline-Datenübertragungsausrüstung, wobei die Datenübertragungsausrüstung einen Zweidraht-/Vierdraht-Wandler (20) umfasst, um eine Datensendekette und die Datenempfangskette mit einer Leitung (L) zu verschalten, wobei der Wandler einen asymmetrischen Differentialtransformator (13) umfasst, dadurch gekennzeichnet, dass es Schritte umfasst des:
    - Messens (E21) der Leistung eines Signals, das in die Empfangskette rückgekoppelt wird, wenn das Sendesignal gesendet wird,
    - Vergleichens (E22) der gemessenen Leistung mit einem vorbestimmten Leistungswert, und
    - Regelns (E23) des Werts einer Kompensationsimpedanz, die in einem Modul mit variabler Kompensationsimpedanz umfasst ist, das zwischen den asymmetrischen Differentialtransformator und die Masse geschaltet ist, wenn die gemessene Leistung außerhalb eines vorbestimmten Intervalls um den vorbestimmten Leistungswert liegt.
  8. Regelverfahren nach Anspruch 7, dadurch gekennzeichnet, dass es dazu geeignet ist, den vorbestimmten Leistungswert zu regeln, und dadurch, dass es Schritte (E1) umfasst des:
    - Sendens eines Referenzsignals,
    - Messens der Leistung eines Signals, das in die Empfangskette rückgekoppelt wird, wenn das Referenzsignal gesendet wird, und
    - Regelns des Werts der Kompensationsimpedanz, um die Leistung des rückgekoppelten Signals zu minimieren, wobei der vorbestimmte Leistungswert auf den Minimalwert der Leistung des rückgekoppelten Signals geregelt wird.
  9. Computerprogramm, das Anweisungen umfasst zum Ausführen der Schritte des Verfahrens nach Anspruch 7 oder 8, wenn das Programm von einem Computer ausgeführt wird.
  10. Aufzeichnungsträger, der von einem Computer gelesen werden kann, auf dem ein Computerprogramm aufgezeichnet ist, das Anweisungen zum Ausführen der Schritte des Verfahrens nach Anspruch 7 oder 8 umfasst.
EP16194575.3A 2015-10-20 2016-10-19 Unterdrückung des übersprechens eines sendesignals in den empfängerpfad einer vorrichtung für die datenübertragung in einem powerline system Active EP3168990B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1559976A FR3042663B1 (fr) 2015-10-20 2015-10-20 Reglage de la reinjection d'un signal d'emission dans une chaine de reception d'un equipement de transmission de donnees par courants porteurs en ligne

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EP3168990A2 EP3168990A2 (de) 2017-05-17
EP3168990A3 EP3168990A3 (de) 2017-07-26
EP3168990B1 true EP3168990B1 (de) 2020-09-02

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CN110780119A (zh) * 2019-10-15 2020-02-11 晶晨半导体（深圳）有限公司 一种使用rf测试设备来测量pcb走线阻抗的方法

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US7142094B1 (en) * 2002-02-20 2006-11-28 Current Grid, Llc Last leg power grid high-speed data transmitter and receiver structures
US6980091B2 (en) * 2002-12-10 2005-12-27 Current Technologies, Llc Power line communication system and method of operating the same
WO2014056575A1 (en) * 2012-10-11 2014-04-17 Sony Corporation Device for power line communication, method for transmitting signals, and method for receiving signals

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FR3042663B1 (fr) 2019-06-21
EP3168990A2 (de) 2017-05-17
FR3042663A1 (fr) 2017-04-21
EP3168990A3 (de) 2017-07-26

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